### Please describe the problem.

Executing git annex copy sometimes does not copy the necessary files. 

### What steps will reproduce the problem?

I do not know how to reproduce it, because it sometimes happens and sometimes not. This is the code I used:

```
$ git annex findkeys --not --in origin-storage
MD5E-s7265--9885654f68b8e72de9b681c8783b3bf8.yaml

$ git annex copy --not --in origin-storage --to origin-storage
### Note that there is no output

$ git annex findkeys --not --in origin-storage
MD5E-s7265--9885654f68b8e72de9b681c8783b3bf8.yaml
## Still there!

11:00 $ git annex findkeys --not --in origin-storage | git annex copy --batch-keys --to origin-storage
copy MD5E-s7265--9885654f68b8e72de9b681c8783b3bf8.yaml (to origin-storage...) 
ok

$ git annex findkeys --not --in origin-storage
## Now the problem is resolved
```

My expectations are that the second and the fourth command do the same thing, but they don't.

### What version of git-annex are you using? On what operating system?

Rocky OS 9
git-annex version: 10.20230926-g44a7b4c9734adfda5912dd82c1aa97c615689f57


